Print Server Doesn't Support Vertical Channel Select SCS Code (181025)


The information in this article applies to:

  • Microsoft SNA Server 3.0
  • Microsoft SNA Server 3.0 SP1
  • Microsoft SNA Server 3.0 SP2
  • Microsoft SNA Server 4.0
This article was previously published under Q181025

SYMPTOMS

Print Server does not support the Vertical Channel Select(VCS) SCS code (X'04 xx'). When Print Server receives a VCS command in the datastream, it does an LF (Line Feed, X'25') instead.

STATUS

Microsoft has confirmed this to be a problem in SNA Server versions 3.0, 3.0 SP1, 3.0 SP2 and 4.0.

This problem was corrected in the latest SNA Server versions 3.0 and 4.0 U.S. Service Packs. For information on obtaining these Service Packs, query on the following word in the Microsoft Knowledge Base (without the spaces):

S E R V P A C K

MORE INFORMATION

With the fix applied, the Ppd3270.dll file is changed so that it recognizes the VCS command and handles it appropriately.

In one scenario, a Host was sending down the following SCS sequence: 
   2B C2 05 62 01 62 0B
This is a Set Vertical Format command, with the following parameters: 
   05 - length of data
   01 - top margin
   62 - bottom margin
        0B - set vertical tab stop to line 11
The Host then sent down the following: 
   04 82
This is a Vertical Channel Select command (04), selecting vertical channel 2 (82). Vertical channel 1 is always the top margin and vertical channel 2 is the first vertical tab stop as defined in the Set Vertical Format command above (that is, line 11). Print Server processes this command by issuing 1 line feed, but it should issue 10 line feeds (to get to line 11.

This can be clearly seen with extended job tracing turned on: 
   s3pr1dat.c(313)     byte: 04 ->  LF/VCS
   s3prdscs.c(61)      ******* FLUSH DATA **********
   winvprtj.c(4725)    LF - MOVE PAGE POSITION DOWN A LINE LINE
   s3prdscs.c(42)      ******* PARSE DATA **********
   s3pr1dat.c(2182)    byte: 82 ->  second byte of VCS - ignore
Printserver is ignoring the '82.'
Modification Type:MinorLast Reviewed:9/22/2005
Keywords:kbHotfixServer kbQFE kbbug kbfix kbprint KB181025
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